//  File: parsemain.C
//
//  Using the parser to create an expression tree.

#include <stdio.h>
#include "token.h"
#include "tokenitem.h"
#include "tokenizer.h"
#include "etree.h"
#include "parse.h"

#define BUFLEN 256 

main() {
   Tokenizer *T ;
   ETree *Expr ;
   char str[BUFLEN] ;

   printf("Enter an expression: ") ;
   fgets(str, BUFLEN, stdin) ;
   fflush(stdin) ;

   T = new Tokenizer(str) ;
   Expr = ParseEverything(T) ;

   if (Expr != NULL) {

	  printf("\nInorder Walk:\n") ;
	  Expr->Inorder() ;
	  printf(" = %d\n", Expr->Evaluate()) ;

	  printf("\nPreorder Walk:\n") ;
	  Expr->Preorder() ;
	  printf("\n") ;

	  printf("\nPreorder Walk:\n") ;
	  Expr->Preorder() ;
	  printf("\n") ;

   }

   delete T ;
}